Applications of digital filters in a wireless liquid level control system

In order to overcome the power frequency electromagnetic interference existing in the wireless liquid level control system and realize the accurate control to the liquid level, a compound digital filter algorithm is proposed and implemented. This article discusses the topology of the wireless liquid level control system, the form and characteristics of the electromagnetic interference signal, the architecture of the digital filter and the algorithm flow chart, finally compares and analyzes actual operation results. The digital filtering algorithm runs effectively and can achieve the purpose of filtering the electromagnetic interference.